2-amino-4-aryl-5-(2-cyano-4,6-dinitro-phenylazo)thiazole compounds

ABSTRACT

MONOAZO COMPOUNDS HAVING A 2-CYANO-4,6-DINITROPHENYL DIAZO COMPONENT AND A 2-AMINO-4-ARYL-5-THIAZOLYL COUPLING COMPONENT PRODUCE BLUE TO GREEN SHADES ON POLYESTER TEXTILE MATERIALS AND EXHIBIT GOOD FASTNESS AND DYEABILITY PROPERTIES.

United States Patent 3,816,391 2-AMlN0-4-ARYL-5-(2 CYANO 4,6 DlNlTRO- PHIENYLAZO)'II-IIAZOLE COMPOUNDS Clarence A. Coates, Jr., and Max A. Weaver, Kingsport, Tenn., assignors to Eastman Kodak Company,

Rochester, NY. No Drawing. Filed Dec. 1, 1971, Ser. No. 203,823 Int. C1. C09!) 29/36; D06p 3/52 US. Cl. 260-158 Claims ABSTRACT OF THE DISCLOSURE Monoazo compounds having a 2-cyano-4,6-dinitrophenyl diazo component and a 2-amino-4-aryl-5-thiazolyl coupling component produce blue to green shades on polyester textile materials and exhibit good fastness and dyeability properties.

This invention concerns novel azo compounds which conform to the general formula N02 R N 2 IL OzN N N s/ N\ wherein R is lower alkyl, cyclohexyl, lower alkylcyclohexyl, aryl or lower alkyl substituted with aryl;

R individually is hydrogen or any of the groups which R can represent;

R individually is lower alkyl; lower alkyl substituted with halogen, hydroxy or lower alkanoyloxy; allyl; or, when R is a group which -R can represent, R also can be hydrogen; and

R and R collectively are pentamethylene or ethyleneoxyethylene;

in which each aryl group is phenyl or phenyl substituted with lower alkyl, lower hydroxyalkyl, lower alkoxy, hydroxy, halogen, cyclohexoxy, cyclohexylmethyl lower alkanoylamino, nitro or lower alkoxycarbonyl.

The azo compounds of the invention produce bright blue to green shades on polyester textile materials when applied thereto by conventional disperse dyeing procedures. In addition to the desirable blue and unique green shades produced by our compounds, they also exhibit an excellent combination of properties including good dyeability, fastness to light and resistance to sublimation.

The substituents represented by R R and R are well known to those skilled in the art and can be derived from commercially available or readily obtainable intermediates. Chlorine and bromine are preferred halogen atoms which can be present on the azo compounds. We also prefer that the aryl groups represented by R and R do not contain more than one substituent. As used herein to describe an alkyl moiety, lower designates a carbon content of one to about four carbon atoms.

A group of our novel compounds which, because of their costzperformance ratio, are particularly preferred are those of formula (I) in which R is phenyl, tolyl, lower alkoxyphenyl or lower alkanoylaminophenyl; R is ice lower alkyl, cyclohexyl, phenyl, tolyl or lower alkoxyphenyl; and R is hydrogen or lower alkyl.

Our novel compounds are prepared by diazotizing 2- cyano-4,6-dinitroaniline and coupling the resulting diazonium salt with a coupler having the formula The Z-aminothiazole couplers are prepared by known methods, e.g., those disclosed in French Pat. 1,600,940.

The following examples will further illustrate our novel azo compounds and their preparation.

EXAMPLES l-10 To 140 ml. of H is added 8.32 g. (0.4 m.) of 2-cyano-4,6-dinitroaniline. The slurry is stirred at 15 C. for 15 minutes and then cooled to 2 C. A solution of 3.0 g. NaNO in 20 ml. conc. H 50 is added portionwise, keeping the temperature below 0 C. The diazotization reaction is stirred at 0 C. for 2 hours. The following couplers (.005 mole each) are dissolved in 25 ml. portions of 1:5 acid (1 part acetic acidzS parts propionic acid) and the solutions cooled in an ice bath:

To each chilled coupler solution is added .005 mole of the diazotized amine. After coupling for 15 minutes, the azo products are precipitated by drowning with water, collected by filtration, washed with water and air dried. The azo compounds are purified by slurrying in hot methanol or ethanol, followed by cooling and filtering. The azo compounds of Examples 2, 5 and 8 produce green shades when applied to polyester fibers. The other examples produce bright neutral blue shades having excellent lightfastness and resistance to sublimation.

The azo compounds set forth in the following Table conform to formula (I). Table Examples 1-8 describe the azo compounds prepared in the preceding examples. The remainder of the compounds described in the Table are prepared by the procedures set forth hereinabove. The color given for each of the azo compounds refers to the shade it produces on polyester fibers.

The invention has been described in considerable detail with particular reference to certain preferred embodiments thereof, but it will be understood that variations and modifications can be effected within the spirit and scope of the invention.

We claim: NO, -N 1. A compound having the formula I OzN N=N (CHa):

NO: N .4 1 1 4. A compound according to claim 1 having the formula l L o H wherein R is phenyl, tolyl, lower alkoxyphenyl or lower 0 N L 1: 5 alkanoylaminophenyl; R is lower alkyl, cyclohexyl, 2 s phenyl, tolyl or lower alkoxyphenyl; and R is hydrogen 5 or lower alkyl.

A compound according to claim 1 having the 5. A compound according to claim 1 having the formula formula 6 6. A compound according to claim 1 having the 8. A compound according to claim 1 having the formula formula N03 -N No, N

1 1 ON N=N\S NEG on:- N=N S N-CHQ References Cited 7. A compound according to claim 1 having the UN TED STATES PATENTS formula 2,746,953 5/1966 Dickey et al. 260 -158 3,324,105 6/1967 Hanke et a1. 260-158 OTHER REFERENCES Beyer et aL, Gesell Ber. Deut. Chem., volume 85,

C1115 FLOYD DALE HIGEL, Pnmary Examiner us. 01. X.R. N 260302 R 

